2005 INFINITI QX4 Factory Service Manual

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Page 617 of 3419

INFINITI QX4 2005 Factory Service Manual AV-28
AUDIO
Revision: October 20052005 QX56
Trouble DiagnosisEKS00BIG
The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference,
etc.). Check the inspec

AV-28
AUDIO
Revision: October 20052005 QX56
Trouble DiagnosisEKS00BIG
The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference,
etc.). Check the inspection items below to diagnose the malfunction.
MALFUNCTION WITH RADIO AND CD
Before proceeding, confirm that other AV switch functions (except audio functions) operate. If not, refer to AV-
145, "Unable to Operate All of AV Switches (Unable to Start Self-Diagnosis)" .
FOR RADIO ONLY
Symptom Possible cause
Inoperative
Audio unit power circuit check. Refer to AV-30, "Power Supply Circuit
Inspection" .
Audio communication line check. Refer to AV-126, "Audio Communication
Line Check (Between Display Control Unit and Audio Unit)" .
AV switch check. Refer to AV- 3 3 , "AV S w i tc h C h e c k" .
If above check is OK, replace audio unit.
Steering switch does not operate
Steering switch check. Refer to AV-32, "Steering Switch Check" .
AV switch check. Refer to AV- 3 3 , "AV S w i tc h C h e c k" .
If above check is OK, replace audio unit.
Audio information is not displayed on screen (with
NAVI)
Display unit check. Refer to AV-101, "Self-Diagnosis Mode (DCU)" .
All speakers do not sound
Audio unit
BOSE speaker amp. power supply and ground circuit check. Refer to AV- 3 0 ,
"Power Supply Circuit Inspection" .
BOSE speaker amp. ON signal
BOSE speaker amp.
One or several speakers do not sound
Front door speaker check. Refer to AV- 3 4 , "Sound Is Not Heard From Front
Door Speaker or Front Tweeter" .
Rear door speaker check. Refer to AV- 3 8 , "Sound Is Not Heard From Rear
Door Speaker or Rear Door Tweeter" .
Subwoofer check. Refer to AV-42, "Sound Is Not Heard From Subwoofer" .
Center speaker check. Refer to AV- 4 1 , "Sound Is Not Heard From Center
Speaker" .
Poor sound
Audio unit
BOSE speaker amp.
Speaker
Noisy
Audio unit
BOSE speaker amp.
Electrical equipment (generator, bonding wire, etc.)
Symptom Possible cause
No sound
Audio unit
Antenna feeder, wiring or connections
Antenna amplifier, power supply, wiring or connections
Noisy
Audio unit
Audio unit case ground
Antenna feeder, wiring or connections
Antenna amplifier, power supply, wiring or connections
Noise prevention parts
Each electrical equipment
Wire harness of each piece of electrical equipment
All radio stations stored in memory are deleted
Audio unit power circuit check. Refer to AV- 3 0 , "Power Supply Cir-
cuit Inspection" .
Audio unit

Page 618 of 3419

INFINITI QX4 2005 Factory Service Manual AUDIO
AV-29
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AV
Revision: October 20052005 QX56
NOTE:
1. The following noise results from variations in field strength, such as fading noise and multi-path noise, or
external noi

AUDIO
AV-29
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Revision: October 20052005 QX56
NOTE:
1. The following noise results from variations in field strength, such as fading noise and multi-path noise, or
external noise from trains and other sources. It is not a malfunction.
Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun-
tains or buildings blocking the signal.
Multi-path noise: This noise results from the waves sent directly from the broadcast station arriving at the
antenna at a different time from the waves which reflect off mountains or buildings.
FOR CD ONLY
Noise InspectionEKS00BIH
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and opera-
tion of each piece of electrical equipment, and determine the cause.
NOTE:
The source of the noise can be found easily by listening to the noise while removing the fuses of electrical
components, one by one.
TYPE OF NOISE AND POSSIBLE CAUSE
Symptom Possible cause
CD cannot be inserted.
CD
Audio unit CD cannot be ejected.
The CD cannot be played.
The sound skips, stops suddenly, or is distorted.
Occurrence condition Possible cause
Occurs only when engine is ON.A continuous growling noise occurs. The speed of
the noise varies with changes in the engine speed.
Ignition components
A whistling noise occurs while the engine speed is
high. A booming noise occurs while the engine is
running and the lighting switch is ON.
Generator
The occurrence of the noise is linked with the operation of the fuel pump.
Fuel pump condenser
Noise only occurs when various
electrical components are oper-
ating.A cracking or snapping sound occurs with the
operation of various switches.
Relay malfunction, audio unit malfunction
The noise occurs when various motors are operat-
ing.
Motor case ground
Motor
The noise occurs constantly, not just under certain conditions.
Rear defogger coil malfunction
Open circuit in printed heater
Poor ground of antenna amplifier or
antenna feeder line
A cracking or snapping sound occurs while the vehicle is being driven, especially
when it is vibrating excessively.
Ground wire of body parts
Ground due to improper part installation
Wiring connections or a short circuit

Page 619 of 3419

INFINITI QX4 2005 Factory Service Manual AV-30
AUDIO
Revision: October 20052005 QX56
Power Supply Circuit InspectionEKS00BII
1. CHECK FUSES
Check that the following fuses are not blown.
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure

Page 620 of 3419

INFINITI QX4 2005 Factory Service Manual AUDIO
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Revision: October 20052005 QX56
2. POWER SUPPLY CIRCUIT CHECK
1. Disconnect audio unit connector M43, subwoofer connector B72 and BOSE speaker amp. connector
M112

Page 621 of 3419

INFINITI QX4 2005 Factory Service Manual AV-32
AUDIO
Revision: October 20052005 QX56
Steering Switch CheckEKS00BIJ
1. AV SWITCH SELF-DIAGNOSIS FUNCTION CHECK
1. Start AV switch self-diagnosis function. Refer to AV- 2 7 , "
AV Switch Self-Di

Page 622 of 3419

INFINITI QX4 2005 Factory Service Manual AUDIO
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Revision: October 20052005 QX56
4. CHECK STEERING SWITCH RESISTANCE
Check resistance between steering switch terminals.
OK or NG
OK >> Inspection End.
NG >> Repla

Page 623 of 3419

INFINITI QX4 2005 Factory Service Manual AV-34
AUDIO
Revision: October 20052005 QX56
Sound Is Not Heard From Front Door Speaker or Front TweeterEKS00BIM
1. HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M113 and suspect speaker conn

Page 624 of 3419

INFINITI QX4 2005 Factory Service Manual AUDIO
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2. FRONT SPEAKER SIGNAL CHECK
1. Connect BOSE speaker amp. connector M113 and suspect speaker connector.
2. Turn ignition switch t

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